Countering.py

class IterCount(object):
    def __init__(self, iterable):
        self._iterable = iterable
        self._count = 0

    def _itercount(self):
        for value in self._iterable:
            self._count += 1
            yield value

    def __iter__(self):
        return self._itercount()

    @property
    def count(self):
        return self._count


class CountItemsWrapper:
    def __init__(self, items):
        self.items = iter(items)
        self.count = 0

    def __next__(self):
        res = next(self.items)
        self.count += 1
        return res

    def __iter__(self):
        return self


# Heh, it's a pun! Like, 'cause I'm "countering" your argument ;)
countering = CountItemsWrapper([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

for x, y in zip(countering, range(5)):
    pass

for item in countering:
    pass

countering.count
#>>> 10

for item in countering:
    pass

countering.count
#>>> 10


# And again...
countering = IterCount([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

for x, y in zip(countering, range(5)):
    pass

for item in countering:
    pass

countering.count
#>>> 16

for item in countering:
    pass

countering.count
#>>> 26